CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
OPERATING ACTIVITIES
Net income	$ 186,274,000	$ 157,638,000	$ 108,391,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	153,638,000	127,099,000	116,359,000
Stock-based compensation expense	8,292,000	7,511,000	6,579,000
Gain on sales of real estate investments	(40,999,000)	(38,859,000)	(13,145,000)
Gain on casualties and involuntary conversion on real estate assets	0	0	(161,000)
Changes in operating assets and liabilities:
Accrued income and other assets	(9,291,000)	(11,572,000)	(4,615,000)
Accounts payable, accrued expenses and prepaid rent	17,176,000	13,298,000	(18,851,000)
Other	1,411,000	1,377,000	1,728,000
NET CASH PROVIDED BY OPERATING ACTIVITIES	316,501,000	256,492,000	196,285,000
INVESTING ACTIVITIES
Development and value-add properties	(494,073,000)	(418,855,000)	(195,446,000)
Purchases of real estate	(2,049,000)	(108,149,000)	(49,199,000)
Real estate improvements	(40,851,000)	(36,665,000)	(33,131,000)
Net proceeds from sales of real estate investments	51,006,000	44,260,000	21,565,000
Leasing commissions	(37,272,000)	(33,301,000)	(17,516,000)
Proceeds from casualties and involuntary conversion on real estate assets	0	0	242,000
Repayments on mortgage loans receivable	0	0	1,679,000
Changes in accrued development costs	4,211,000	21,678,000	(5,339,000)
Changes in other assets and other liabilities	(2,120,000)	1,769,000	(11,111,000)
NET CASH USED IN INVESTING ACTIVITIES	(521,148,000)	(529,263,000)	(288,256,000)
FINANCING ACTIVITIES
Proceeds from unsecured bank credit facilities	942,173,000	625,520,000	625,387,000
Repayments on unsecured bank credit facilities	(981,383,000)	(541,310,000)	(613,097,000)
Proceeds from unsecured debt	525,000,000	175,000,000	275,000,000
Repayments on unsecured debt	(75,000,000)	(40,000,000)	(105,000,000)
Repayments on secured debt	(60,096,000)	(76,920,000)	(54,306,000)
Debt issuance costs	(2,067,000)	(2,678,000)	(1,090,000)
Distributions paid to stockholders (not including dividends accrued)	(193,936,000)	(131,759,000)	(119,765,000)
Proceeds from common stock offerings	75,622,000	273,409,000	91,055,000
Common stock offering related costs	(247,000)	(312,000)	(334,000)
Other	(29,756,000)	(3,807,000)	(6,082,000)
NET CASH PROVIDED BY FINANCING ACTIVITIES	200,310,000	277,143,000	91,768,000
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(4,337,000)	4,372,000	(203,000)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	4,393,000	21,000	224,000
CASH AND CASH EQUIVALENTS AT END OF YEAR	56,000	4,393,000	21,000
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest, net of amount capitalized of $12,393, $9,028, and $9,651 for 2022, 2021, and 2020, respectively	34,110,000	31,658,000	32,362,000
Capitalized interest	12,393,000	9,028,000	9,651,000
Cash paid for operating lease liabilities	1,793,000	1,707,000	1,476,000
Common stock issued in the purchase of real estate	303,682,000	0	0
Debt assumed in the purchase of real estate	60,000,000	0	0
NON-CASH OPERATING ACTIVITY
Operating lease liabilities arising from obtaining right of use assets	$ 559,000	$ 13,056,000	$ 495,000